for a background process and return

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Hi
I am try to run something like this in my cgi.
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system ("sleep 3000 &");
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Since, it is time-consuming task, I let it run in background and 
immediately return to user. I tested this script. It was no problem for 
a standalone perl script. However, once I had this script in a perl cgi. 
The script seemed  not to have this system command run in background. It 
waited there for the child process to finish.
Any clue for why it behaved like that? How can I for a child process in 
background and return immediately to the web user?

Help is really appreciated!

jason zhang